I think in reality the headers have very little to do with how an engine sounds. I think most long tube headers will sound the same.
Mufflers have the biggest effect on how an engine sounds, X or H pipes will make the sound higher pitched, and bigger pipe size should make it louder and lower.
An engine's compression and cam selection will have a big effect too. Low compression and a large cam will sound sloppy, more compression and a big cam will sound crisp.
Just my opinion.
E85 racer and E85 carb builder
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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle